It depends upon the environment as to which antivirus I use. For business clients, I use ClamAV because its license allows business use. For clients personal use, I recommend AVG. The only thing I have against Avast is the mandatory registration. For my personal and business use, I do not really need an antivirus due to the fact that I stay away from M$ operating systems. However, to protect Windows users who may get forwarded emails from me, I use ClamAV.
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